[en] Oxidative dissolution of plutonium dioxide with electrogenerated Silver(II) was undertaken first at analytical scale in order to emerge the parameters controlling this dissolution process and to prove the feasibility of that technique at 300 grams scale of material. The influence of the following parameters: mass of PuO₂, current density, total concentration of silver ion, nitric acid concentration, temperature, agitation efficiency on the rate of PuO₂ dissolution was studied. The results demonstrate that: the limiting step of the dissolution process is the electrogeneration of Silver(II), the dissolution of PuO₂ can be realized with a good current efficiency, the best temperature range is: 30+-10⁰C, the optimum HNO3 concentration is 4 to 6 M, the Pu(VI) solution up to 500 g.l^-1 can be prepared. A six liters capacity thermostated glass electrolyzer was built including an anodic compartment equipped with a 1000 cm² cylindrical platinum grid electrode and a tantalum propeller, a cathodic compartment consisting in a 0.2 liter capacity aluminium silicate diaphragm with a tantalum rod cathode. Quantitative dissolutions of 300 g of PuO₂ in 4 M HNO₃ were performed in two hours by imposing an intensity of 60A